Effects of rice straw particle size on digesta particle size distribution, nitrogen metabolism, blood biochemical parameters, microbial amino acid composition and intestinal amino acid digestibility in goats

• Published in: Animal science journal 2011-02, Vol.82 (1), p.78-85
• Main Authors: Wang, Min, Zhao, Xiao Gang, Liao, Hai Yan, Tan, Zhi Liang, Tang, Shao Xun, Sun, Zhi Hong, Zhou, Chuan She, Han, Xue Feng
• Format: Article
• Language: English
• Subjects: amino acid; Amino acid composition; Amino acids; Amino Acids - metabolism; Amylases - blood; Animal Feed; Animal sciences; Animals; Biochemistry; Blood; Blood Glucose; Blood Urea Nitrogen; Cholesterol - blood; Detergents; Dietary Fiber; Diets; digesta; Digestibility; Digestion - physiology; Digestive system; Digestive tract; Duodenum; Feces; Feeds; Fibers; Fistulae; goat; Goats; Goats - physiology; Ileum; Intestines - metabolism; Intestines - microbiology; Lactic Acid - blood; Large intestine; Lipase - blood; Metabolism; neutral detergent fiber; Nitrogen; Nitrogen - metabolism; Oryza - chemistry; Oryza sativa; Particle Size; particle size distribution; physical effective NDF; rice straw; Rumen; Small intestine; Straw
• ISSN: 1344-3941; 1740-0929
• DOI: 10.1111/j.1740-0929.2010.00809.x

Effects of rice straw particle size and physically effective neutral detergent fiber (peNDF) on particle size distribution of different digestive tract, nitrogen (N) metabolism, blood biochemical parameters, microbial amino acid (AA) composition and intestinal AA digestibility in goats were investigated. A 4 × 4 Latin square design was employed using four mature Liuyang black goats fitted with permanent ruminal, duodenal, and terminal ileal fistulae. During each of the four periods, goats were offered one of four diets that were similar in chemical composition, but varied in particle sizes and peNDF through alteration of the theoretical cut length of rice straw (10, 20, 40 and 80 mm, respectively). Dietary peNDF contents of four diets were 17.4, 20.9, 22.5 and 25.4%, respectively. Results showed that increasing particle size of rice straw and dietary peNDF significantly affected the particle size distributions of digesta in rumen, duodenum and ileum, except feces. However, increasing particle size of rice straw and peNDF did not affected N metabolism in goats, except the increased apparent N digestibility in rumen and large intestine, and the decreased apparent N digestibility in small intestine. Furthermore, increasing particle size of rice straw and peNDF showed little influence on the profile of blood biochemical parameters, microbial AA composition and intestinal AA digestibility in goats.